I`m new ad the android development and i am working with Eclipse incl. Android plug-ins, i having a problem with the apk file.

last two weeks i was bissy with making a Android App, wen i was don i want to put the apk file on my phone that was no problem, but wen i want to instal i get a message that the instalationprogram is stopt.

the streght thing is that older apk files withs wone i made i can instal. and now every time i make somting in don`t instal.